How to pronounce “celestial body” in English

Furthermore, some talk about exploring or even migrating to Mars. What do you think the challenges will be in executing exploration or migration to Mars.Humans have only physically been to the moon and it is the celestial body closest to earth.A light can reach to the moon in one second. It takes 3 days with a rocket. The last time a human traveled to the moon was December, 1972, when Apollo #17 landed.